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教材中的例题或习题是本节重点知识的体现,反映了学习本节内容所要达到的目的,同时也提供了解此类问题所需要的一般方法或结论.因此,我
The examples or exercises in the textbooks are the embodiment of the key knowledge in this section. They reflect the purpose of learning the contents of this section, and also provide the general methods or conclusions needed to understand such problems. Therefore, I